i think it should work year round, coyotes lack the ability to reason so if they hear distress and have a visual aid i think natural instinct will kick in. kind of like how you can go from cotton tail distress to wood pecker distress to pup in distress and finally get a coyote to come in, they dont have the ability to say "hey its a little strange there is a rabbit, a bird and a pup all dying at the same time in the same spot.. its all about finding what makes that particular dog interested in what you are offering